11 struct list_head rq_list;
12 } ____cacheline_aligned_in_smp;
15 unsigned int index_hw;
17 /* incremented at dispatch time */
18 unsigned long rq_dispatched[2];
19 unsigned long rq_merged;
21 /* incremented at completion time */
22 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
23 struct blk_rq_stat stat[2];
25 struct request_queue *queue;
27 } ____cacheline_aligned_in_smp;
29 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
30 void blk_mq_freeze_queue(struct request_queue *q);
31 void blk_mq_free_queue(struct request_queue *q);
32 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
33 void blk_mq_wake_waiters(struct request_queue *q);
34 bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *, struct list_head *);
35 void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
38 * Internal helpers for allocating/freeing the request map
40 void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
41 unsigned int hctx_idx);
42 struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
43 unsigned int hctx_idx);
46 * Internal helpers for request insertion into sw queues
48 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
54 void blk_mq_enable_hotplug(void);
55 void blk_mq_disable_hotplug(void);
58 * CPU -> queue mappings
60 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
62 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
65 return q->queue_hw_ctx[q->mq_map[cpu]];
71 extern int blk_mq_sysfs_register(struct request_queue *q);
72 extern void blk_mq_sysfs_unregister(struct request_queue *q);
73 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
75 extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
77 void blk_mq_release(struct request_queue *q);
79 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
82 return per_cpu_ptr(q->queue_ctx, cpu);
86 * This assumes per-cpu software queueing queues. They could be per-node
87 * as well, for instance. For now this is hardcoded as-is. Note that we don't
88 * care about preemption, since we know the ctx's are persistent. This does
89 * mean that we can't rely on ctx always matching the currently running CPU.
91 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
93 return __blk_mq_get_ctx(q, get_cpu());
96 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
101 struct blk_mq_alloc_data {
102 /* input parameter */
103 struct request_queue *q;
106 /* input & output parameter */
107 struct blk_mq_ctx *ctx;
108 struct blk_mq_hw_ctx *hctx;
111 static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
112 struct request_queue *q, unsigned int flags,
113 struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
121 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
123 return data->hctx->tags;
127 * Internal helpers for request allocation/init/free
129 void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
130 struct request *rq, unsigned int op);
131 void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
133 struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
136 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
138 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
141 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
143 return hctx->nr_ctx && hctx->tags;